After completing this chapter you should be able to:Describe the composition of a typical Link-11 system.Describe the operation of the Link-11 transmission and receive cycles.Describe the six operating modes of the Link-11 system.Describe the function of the Link-11 encryption (security) device.Describe the audio tones generated by the Link-11 Data Terminal Set.Describe the word formats used to transmit Link-11 tactical data.Describe the message formats used in the various Link-11 operatingmodes.Describe the Operation of the Link-11 Data Terminal Set.LINK-11 FUNDAMENTALSantenna coupler, and an antenna. The data terminalset is the center of the Link-11 system and is coveredTo monitor the operation of and performin detail later in this chapter. The communicationsmaintenance on the Link-11 system, you mustswitchboard is used to select the desired HF or UHFunderstand how the different pieces of equipmenttransceiver. An external frequency standard is alsointeract with each other. Lets take a look at a basicpart of many Link-11 systems. Additionally, theLink-11 system.Shipboard Gridlock System (SGS) is installed onmany ships. On SGS-equipped ships, an AN/UYK-20LINK-11 SYSTEM OVERVIEWis placed in the line between the CDS computer andthe crypto device.A typical shipboard Link-11 communicationssystem (figure 4-2) and consists of the followingCDS Computerc o m p o n e n t s : t h e C D S d i g i t a l c o m p u t e r , acryptographic device, the Link-11 data terminal set,The central processor of the Combat Directionthe communications switchboard, and the HF or UHFSystem is the CDS computer. Keeping a data base ofradio set transceivers (transmitter-receiver), antracks is among the many functions of the operationalFigure 4-2.The Link-11 communications system.4 -2